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75 lines
1.7 KiB
75 lines
1.7 KiB
/**
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* File: array_stack.kt
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* Created Time: 2024-01-25
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* Author: curtishd (1023632660@qq.com)
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*/
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package chapter_stack_and_queue
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/* 基於陣列實現的堆疊 */
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class ArrayStack {
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// 初始化串列（動態陣列）
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private val stack = mutableListOf<Int>()
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/* 獲取堆疊的長度 */
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fun size(): Int {
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return stack.size
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}
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/* 判斷堆疊是否為空 */
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fun isEmpty(): Boolean {
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return size() == 0
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}
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/* 入堆疊 */
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fun push(num: Int) {
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stack.add(num)
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}
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/* 出堆疊 */
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fun pop(): Int {
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if (isEmpty()) throw IndexOutOfBoundsException()
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return stack.removeAt(size() - 1)
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}
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/* 訪問堆疊頂元素 */
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fun peek(): Int {
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if (isEmpty()) throw IndexOutOfBoundsException()
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return stack[size() - 1]
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}
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/* 將 List 轉化為 Array 並返回 */
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fun toArray(): Array<Any> {
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return stack.toTypedArray()
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}
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}
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/* Driver Code */
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fun main() {
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/* 初始化堆疊 */
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val stack = ArrayStack()
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/* 元素入堆疊 */
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stack.push(1)
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stack.push(3)
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stack.push(2)
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stack.push(5)
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stack.push(4)
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println("堆疊 stack = ${stack.toArray().contentToString()}")
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/* 訪問堆疊頂元素 */
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val peek = stack.peek()
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println("堆疊頂元素 peek = $peek")
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/* 元素出堆疊 */
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val pop = stack.pop()
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println("出堆疊元素 pop = $pop，出堆疊後 stack = ${stack.toArray().contentToString()}")
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/* 獲取堆疊的長度 */
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val size = stack.size()
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println("堆疊的長度 size = $size")
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/* 判斷是否為空 */
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val isEmpty = stack.isEmpty()
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println("堆疊是否為空 = $isEmpty")
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} |